Commit | Line | Data |
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0dc8c760 JE |
1 | /* |
2 | * xt_CONNMARK - Netfilter module to modify the connection mark values | |
1da177e4 | 3 | * |
0dc8c760 JE |
4 | * Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com> |
5 | * by Henrik Nordstrom <hno@marasystems.com> | |
6 | * Copyright © CC Computer Consultants GmbH, 2007 - 2008 | |
7 | * Jan Engelhardt <jengelh@computergmbh.de> | |
1da177e4 LT |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | */ | |
23 | #include <linux/module.h> | |
24 | #include <linux/skbuff.h> | |
25 | #include <linux/ip.h> | |
26 | #include <net/checksum.h> | |
27 | ||
3a4fa0a2 | 28 | MODULE_AUTHOR("Henrik Nordstrom <hno@marasystems.com>"); |
2ae15b64 | 29 | MODULE_DESCRIPTION("Xtables: connection mark modification"); |
1da177e4 | 30 | MODULE_LICENSE("GPL"); |
2e4e6a17 | 31 | MODULE_ALIAS("ipt_CONNMARK"); |
73aaf935 | 32 | MODULE_ALIAS("ip6t_CONNMARK"); |
1da177e4 | 33 | |
2e4e6a17 HW |
34 | #include <linux/netfilter/x_tables.h> |
35 | #include <linux/netfilter/xt_CONNMARK.h> | |
f6180121 | 36 | #include <net/netfilter/nf_conntrack_ecache.h> |
1da177e4 LT |
37 | |
38 | static unsigned int | |
0dc8c760 JE |
39 | connmark_tg_v0(struct sk_buff *skb, const struct net_device *in, |
40 | const struct net_device *out, unsigned int hooknum, | |
41 | const struct xt_target *target, const void *targinfo) | |
1da177e4 | 42 | { |
2e4e6a17 | 43 | const struct xt_connmark_target_info *markinfo = targinfo; |
587aa641 PM |
44 | struct nf_conn *ct; |
45 | enum ip_conntrack_info ctinfo; | |
bf3a46aa | 46 | u_int32_t diff; |
82e91ffe | 47 | u_int32_t mark; |
bf3a46aa | 48 | u_int32_t newmark; |
1da177e4 | 49 | |
3db05fea | 50 | ct = nf_ct_get(skb, &ctinfo); |
587aa641 | 51 | if (ct) { |
90528e6f PM |
52 | switch(markinfo->mode) { |
53 | case XT_CONNMARK_SET: | |
587aa641 PM |
54 | newmark = (ct->mark & ~markinfo->mask) | markinfo->mark; |
55 | if (newmark != ct->mark) { | |
56 | ct->mark = newmark; | |
a71996fc | 57 | nf_conntrack_event_cache(IPCT_MARK, ct); |
2822b0d9 | 58 | } |
90528e6f PM |
59 | break; |
60 | case XT_CONNMARK_SAVE: | |
587aa641 | 61 | newmark = (ct->mark & ~markinfo->mask) | |
3db05fea | 62 | (skb->mark & markinfo->mask); |
587aa641 PM |
63 | if (ct->mark != newmark) { |
64 | ct->mark = newmark; | |
a71996fc | 65 | nf_conntrack_event_cache(IPCT_MARK, ct); |
90528e6f PM |
66 | } |
67 | break; | |
68 | case XT_CONNMARK_RESTORE: | |
3db05fea | 69 | mark = skb->mark; |
587aa641 | 70 | diff = (ct->mark ^ mark) & markinfo->mask; |
3db05fea | 71 | skb->mark = mark ^ diff; |
90528e6f | 72 | break; |
2521c12c | 73 | } |
1da177e4 LT |
74 | } |
75 | ||
2e4e6a17 | 76 | return XT_CONTINUE; |
1da177e4 LT |
77 | } |
78 | ||
0dc8c760 JE |
79 | static unsigned int |
80 | connmark_tg(struct sk_buff *skb, const struct net_device *in, | |
81 | const struct net_device *out, unsigned int hooknum, | |
82 | const struct xt_target *target, const void *targinfo) | |
83 | { | |
84 | const struct xt_connmark_tginfo1 *info = targinfo; | |
85 | enum ip_conntrack_info ctinfo; | |
86 | struct nf_conn *ct; | |
87 | u_int32_t newmark; | |
88 | ||
89 | ct = nf_ct_get(skb, &ctinfo); | |
90 | if (ct == NULL) | |
91 | return XT_CONTINUE; | |
92 | ||
93 | switch (info->mode) { | |
94 | case XT_CONNMARK_SET: | |
95 | newmark = (ct->mark & ~info->ctmask) ^ info->ctmark; | |
96 | if (ct->mark != newmark) { | |
97 | ct->mark = newmark; | |
a71996fc | 98 | nf_conntrack_event_cache(IPCT_MARK, ct); |
0dc8c760 JE |
99 | } |
100 | break; | |
101 | case XT_CONNMARK_SAVE: | |
102 | newmark = (ct->mark & ~info->ctmask) ^ | |
103 | (skb->mark & info->nfmask); | |
104 | if (ct->mark != newmark) { | |
105 | ct->mark = newmark; | |
a71996fc | 106 | nf_conntrack_event_cache(IPCT_MARK, ct); |
0dc8c760 JE |
107 | } |
108 | break; | |
109 | case XT_CONNMARK_RESTORE: | |
110 | newmark = (skb->mark & ~info->nfmask) ^ | |
111 | (ct->mark & info->ctmask); | |
112 | skb->mark = newmark; | |
113 | break; | |
114 | } | |
115 | ||
116 | return XT_CONTINUE; | |
117 | } | |
118 | ||
e1931b78 | 119 | static bool |
0dc8c760 JE |
120 | connmark_tg_check_v0(const char *tablename, const void *entry, |
121 | const struct xt_target *target, void *targinfo, | |
122 | unsigned int hook_mask) | |
1da177e4 | 123 | { |
a47362a2 | 124 | const struct xt_connmark_target_info *matchinfo = targinfo; |
1da177e4 | 125 | |
2e4e6a17 | 126 | if (matchinfo->mode == XT_CONNMARK_RESTORE) { |
90528e6f PM |
127 | if (strcmp(tablename, "mangle") != 0) { |
128 | printk(KERN_WARNING "CONNMARK: restore can only be " | |
129 | "called from \"mangle\" table, not \"%s\"\n", | |
130 | tablename); | |
e1931b78 | 131 | return false; |
90528e6f | 132 | } |
1da177e4 | 133 | } |
bf3a46aa HW |
134 | if (matchinfo->mark > 0xffffffff || matchinfo->mask > 0xffffffff) { |
135 | printk(KERN_WARNING "CONNMARK: Only supports 32bit mark\n"); | |
e1931b78 | 136 | return false; |
bf3a46aa | 137 | } |
67b4af29 JE |
138 | if (nf_ct_l3proto_try_module_get(target->family) < 0) { |
139 | printk(KERN_WARNING "can't load conntrack support for " | |
df54aae0 | 140 | "proto=%u\n", target->family); |
67b4af29 JE |
141 | return false; |
142 | } | |
e1931b78 | 143 | return true; |
1da177e4 LT |
144 | } |
145 | ||
0dc8c760 JE |
146 | static bool |
147 | connmark_tg_check(const char *tablename, const void *entry, | |
148 | const struct xt_target *target, void *targinfo, | |
149 | unsigned int hook_mask) | |
150 | { | |
151 | if (nf_ct_l3proto_try_module_get(target->family) < 0) { | |
152 | printk(KERN_WARNING "cannot load conntrack support for " | |
153 | "proto=%u\n", target->family); | |
154 | return false; | |
155 | } | |
156 | return true; | |
157 | } | |
158 | ||
11078c37 | 159 | static void |
d3c5ee6d | 160 | connmark_tg_destroy(const struct xt_target *target, void *targinfo) |
11078c37 YK |
161 | { |
162 | nf_ct_l3proto_module_put(target->family); | |
163 | } | |
164 | ||
7ce975b9 PM |
165 | #ifdef CONFIG_COMPAT |
166 | struct compat_xt_connmark_target_info { | |
167 | compat_ulong_t mark, mask; | |
168 | u_int8_t mode; | |
169 | u_int8_t __pad1; | |
170 | u_int16_t __pad2; | |
171 | }; | |
172 | ||
0dc8c760 | 173 | static void connmark_tg_compat_from_user_v0(void *dst, void *src) |
7ce975b9 | 174 | { |
a47362a2 | 175 | const struct compat_xt_connmark_target_info *cm = src; |
7ce975b9 PM |
176 | struct xt_connmark_target_info m = { |
177 | .mark = cm->mark, | |
178 | .mask = cm->mask, | |
179 | .mode = cm->mode, | |
180 | }; | |
181 | memcpy(dst, &m, sizeof(m)); | |
182 | } | |
183 | ||
0dc8c760 | 184 | static int connmark_tg_compat_to_user_v0(void __user *dst, void *src) |
7ce975b9 | 185 | { |
a47362a2 | 186 | const struct xt_connmark_target_info *m = src; |
7ce975b9 PM |
187 | struct compat_xt_connmark_target_info cm = { |
188 | .mark = m->mark, | |
189 | .mask = m->mask, | |
190 | .mode = m->mode, | |
191 | }; | |
192 | return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0; | |
193 | } | |
194 | #endif /* CONFIG_COMPAT */ | |
195 | ||
d3c5ee6d | 196 | static struct xt_target connmark_tg_reg[] __read_mostly = { |
4470bbc7 PM |
197 | { |
198 | .name = "CONNMARK", | |
0dc8c760 | 199 | .revision = 0, |
ee999d8b | 200 | .family = NFPROTO_IPV4, |
0dc8c760 | 201 | .checkentry = connmark_tg_check_v0, |
d3c5ee6d | 202 | .destroy = connmark_tg_destroy, |
0dc8c760 | 203 | .target = connmark_tg_v0, |
4470bbc7 | 204 | .targetsize = sizeof(struct xt_connmark_target_info), |
7ce975b9 PM |
205 | #ifdef CONFIG_COMPAT |
206 | .compatsize = sizeof(struct compat_xt_connmark_target_info), | |
0dc8c760 JE |
207 | .compat_from_user = connmark_tg_compat_from_user_v0, |
208 | .compat_to_user = connmark_tg_compat_to_user_v0, | |
7ce975b9 | 209 | #endif |
4470bbc7 PM |
210 | .me = THIS_MODULE |
211 | }, | |
212 | { | |
213 | .name = "CONNMARK", | |
0dc8c760 | 214 | .revision = 0, |
ee999d8b | 215 | .family = NFPROTO_IPV6, |
0dc8c760 | 216 | .checkentry = connmark_tg_check_v0, |
d3c5ee6d | 217 | .destroy = connmark_tg_destroy, |
0dc8c760 | 218 | .target = connmark_tg_v0, |
4470bbc7 | 219 | .targetsize = sizeof(struct xt_connmark_target_info), |
34f4c429 PM |
220 | #ifdef CONFIG_COMPAT |
221 | .compatsize = sizeof(struct compat_xt_connmark_target_info), | |
0dc8c760 JE |
222 | .compat_from_user = connmark_tg_compat_from_user_v0, |
223 | .compat_to_user = connmark_tg_compat_to_user_v0, | |
34f4c429 | 224 | #endif |
4470bbc7 PM |
225 | .me = THIS_MODULE |
226 | }, | |
0dc8c760 JE |
227 | { |
228 | .name = "CONNMARK", | |
229 | .revision = 1, | |
ee999d8b | 230 | .family = NFPROTO_IPV4, |
0dc8c760 JE |
231 | .checkentry = connmark_tg_check, |
232 | .target = connmark_tg, | |
233 | .targetsize = sizeof(struct xt_connmark_tginfo1), | |
234 | .destroy = connmark_tg_destroy, | |
235 | .me = THIS_MODULE, | |
236 | }, | |
237 | { | |
238 | .name = "CONNMARK", | |
239 | .revision = 1, | |
ee999d8b | 240 | .family = NFPROTO_IPV6, |
0dc8c760 JE |
241 | .checkentry = connmark_tg_check, |
242 | .target = connmark_tg, | |
243 | .targetsize = sizeof(struct xt_connmark_tginfo1), | |
244 | .destroy = connmark_tg_destroy, | |
245 | .me = THIS_MODULE, | |
246 | }, | |
1da177e4 LT |
247 | }; |
248 | ||
d3c5ee6d | 249 | static int __init connmark_tg_init(void) |
1da177e4 | 250 | { |
d3c5ee6d JE |
251 | return xt_register_targets(connmark_tg_reg, |
252 | ARRAY_SIZE(connmark_tg_reg)); | |
1da177e4 LT |
253 | } |
254 | ||
d3c5ee6d | 255 | static void __exit connmark_tg_exit(void) |
1da177e4 | 256 | { |
d3c5ee6d | 257 | xt_unregister_targets(connmark_tg_reg, ARRAY_SIZE(connmark_tg_reg)); |
1da177e4 LT |
258 | } |
259 | ||
d3c5ee6d JE |
260 | module_init(connmark_tg_init); |
261 | module_exit(connmark_tg_exit); |